Automobile vehicle seat including a backrest pivoting in relation to the seat pan and which can be placed in table position

Abstract

The seat includes a backrest ( 2 ) installed so as to pivot on the seat pan ( 1 ) and arranged to be placed in a table position where the rear wall of the backrest is maintained in horizontal position, more or less parallel to a seat support frame ( 3 ) arranged to be attached to the floor ( 5 ) of the vehicle, the seat pan ( 1 ) being itself installed on the said frame in a tiltable manner, so that it can be positioned, with a sufficient tilt angle, the rear of the seat pan being raised, so that the backrest tilted on the seat pan can be placed in the said table position. The seat pan ( 1 ) is attached to the frame ( 3 ) by a set of links ( 6, 7 ) forming, with the frame and the seat pan, a deformable quadrilateral (ABCD) such that a pivoting of the links leads to the deformation of the said quadrilateral to place the seat pan in the said sufficient tilt angle position, and locking means ( 10 ) are provided to lock the pivoting of the links in relation to the seat pan or the frame.

1. Automobile vehicle seat comprising:
 a backrest ( 2 ) installed so as to pivot on a seat pan (l) and arranged to be placed in a table position where the rear wall of the backrest is maintained horizontal more or less parallel to a seat support frame ( 3 ) arranged to be attached to the floor ( 5 ) of the vehicle, 
 the seat pan ( 1 ) being installed in a tiltable manner on said frame so that the seat pan can be positioned with a first tilt angle where the rear of the seat pan is raised to place the backrest, tilted on the seat pan, in the table position, 
 the seat pan ( 1 ) being connected to the frame ( 3 ) by a set of links ( 6 ,  7 ) forming two opposite sides of a deformable quadrilateral (ABCD) the two other sides of which are formed respectively by the frame and the seat pan, said links having pivot points that are fixed relative to the frame and seat pan, wherein pivoting of the links leads to the deformation of said quadrilateral so as to place the seat pan in said first tilt angle position; and 
 locking means ( 10 ) for locking the pivoting of the links in relation to the seat pan or the frame, 
 wherein the set of links includes front links ( 6 ) hinged on the frame ( 3 ) at a first point and on the seat pan ( 1 ) at a second point, and rear links ( 7 ) hinged on the frame at a third point and on the seat pan at a fourth point, the distance between the second and fourth points being less than the distance between the first and third points. 
 
   
   
     2. Automobile vehicle seat comprising:
 a backrest ( 2 ) installed so as to pivot on a seat pan ( 1 ) and arranged to be placed in a table position where the rear wall of the backrest is maintained horizontal more or less parallel to a seat support frame ( 3 ) arranged to be attached to the floor ( 5 ) of the vehicle, 
 the seat pan ( 1 ) being installed in a tiltable manner on said frame so that the seat pan can be positioned with a first tilt angle where the rear of the seat pan is raised to place the backrest, tilted on the seat pan, in the table position, 
 the seat pan ( 1 ) being connected to the frame ( 3 ) by a set of links ( 6 ,  7 ) forming two opposite sides of a deformable quadrilateral (ABCD) the two other sides of which are formed respectively by the frame and the seat pan, said links having pivot points that are fixed relative to the frame and seat pan, wherein pivoting of the links leads to the deformation of said quadrilateral so as to place the seat pan in said first tilt angle position; and 
 locking means ( 10 ) for locking the pivoting of the links in relation to the seat pan or the frame, 
 wherein the links ( 6 ,  7 ) are arranged so that the seat pan ( 1 ) can be placed in one or more relaxation positions, the rear of the seat pan being lowered, the locking means ( 10 ) allowing the links to be locked in each of said relaxation positions. 
 
   
   
     3. Automobile vehicle seat comprising:
 a seat pan ( 1 ) installed so that the seat pan can tilt on a seat support frame ( 3 ) arranged to be attached to the floor ( 5 ) of the vehicle; and 
 a backrest ( 2 ) installed so as to pivot on the seat pan and tiltable on the seat pan to a stop position, 
 the seat pan being connected to the frame by a set of links ( 6 ,  7 ), hinged on the frame and the seat pan and lockable in tilt angle, said links having pivot points that are fixed relative to the frame and seat pan, the links forming with the frame and the seat pan a deformable quadrilateral (ABCD) such that the seat can be placed in the following positions: 
 a current utilisation position, in which the backrest ( 2 ) is raised and the seat pan ( 1 ) is tilted towards the rear in relation to the floor ( 5 ) according to a second tilt angle where the rear of the seat pan is lower than the front, and 
 a table function position, in which the rear of the seat pan is raised, the seat pan being tilted towards the front in relation to the floor according to a first tilt angle where a rear wall of the backrest can be maintained in horizontal position, more or less parallel to the floor. 
 
   
   
     4. The seat in accordance with  claim 3 , wherein the deformable quadrilateral (ABCD) can be deformed so that the seat can be complementarily placed in one or more relaxation positions in which the backrest is raised and the seat pan is tilted towards the rear in relation to the floor according to one or more tilt angles greater than the second tilt angle.